Just as I thought this might happen!

Countess Paula, who accomplished the great feat of personifying and manifesting spirits. But one day, the spirit demands to sever their contract, saying it wants to become the property of a saint. Paula, who retains memories of her previous life, readily agrees to sever the contract with a "Yeah, yeah, I knew it," but...? A worn-out trope that's been done countless times over. Since it's an otherworldly fantasy, the setting is loose. I'd be happy if you enjoy it using your imagination as you like.